Jupiter is the largest planet in the Sol system. It is an ammonia cloud gas giant with numerous moons, the most notable of which are Ganymede, Callisto, Europa and Io. Named after the principle Roman god, it is the first of the Jovian planets.

Jupiter is also believed to have primordial, organic life in its atmosphere, though this remains unconfirmed. If any native life is present in Jupiter's atmosphere, it resides too close to the giant's core to be observed or detected by modern equipment.